Ammonium chloride (NH₄Cl) decomposes upon heating into ammonia gas (NH₃) and hydrogen chloride gas (HCl). The balanced chemical equation for this thermal decomposition is:

NH₄Cl (s) → NH₃ (g) + HCl (g)

Here's a breakdown of the equation:

* NH₄Cl (s): Solid ammonium chloride

* NH₃ (g): Ammonia gas

* HCl (g): Hydrogen chloride gas

Important Note: This decomposition reaction is reversible. The ammonia and hydrogen chloride gases can recombine to form ammonium chloride if the temperature is lowered and the pressure is increased.